Idaios the Ferryman

Idaios the Ferryman (died 431 BC) was a Greek mercenary during the Peloponnesian War.

Biography
Idaios the Ferryman was said to be an almost indomitable giant. He appeared one day, but nobody knew from where. Little more is known about him than that his nickname was deserved, for shortly after meeting him most were in need of the Ferryman's services (referring to Charon, the ferryman to the Underworld). In 431 BC, he was hired to hunt down and kill the rival mercenary Kassandra, and he found her in Athens. However, she killed him with an arrow to the head.